An example of respect for the idea of diversity is
a. a town government displaying symbols from only one cultures holiday
b. allowing radical or ethnic minorities to be discriminated
c. rules that protect the right of minorities
d. none of these are examples of respect for the idea of diversity

The idea of DIVERSITY is how everyone comes from different places.  Respecting the idea of diversity means embracing all ethnicities and cultures, no matter how different.

Is A correct?  If you were to respect differences, you would display the symbols of ALL cultures' holidays, not just one's.

What about B?  Discrimination (picking on someone because they're different) is NEVER respecting people who are different!

And C?  That's actually correct!  By protecting people who are different, you show respect!

Since D is none of the above, since we found C, this can't be correct.

C